Ultrafast Orbital-Selective Photodoping Melts Charge Order in Overdoped Bi-based Cuprates

Byungjune Lee; Hoyoung Jang; Hyeongi Choi; Junhan Huang; Li Yue; Nanlin Wang; Qingzheng Qiu; Qizhi Li; Tao Dong; Xingjiang Zhou

REVIEW 3 major objections 3 minor 64 references

Ultrafast Orbital-Selective Photodoping Melts Charge Order in Overdoped Bi-based Cuprates

T0 review · 3 major / 3 minor · reviewed 2026-08-07 · deepseek-v4-flash

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Pith's one-line read In overdoped cuprates, 400 nm light melts the charge order while 800 nm light cannot, revealing an orbital-selective photodoping mechanism and a ~3 ps recovery time that matches underdoped cuprates.

desk verdict Wavelength-dependent photodoping result is credible and new, but the ~3 ps 'CO recovery' is the least secure link and the universality claim outruns the data. read the letter →

arxiv 2506.04697 v1 pith:V3AQRWLG submitted 2025-06-05 cond-mat.supr-con cond-mat.str-el

Xinyi Jiang , Qizhi Li , Qingzheng Qiu , Li Yue , Junhan Huang , Yiwen Chen , Byungjune Lee , Hyeongi Choi

show 5 more authors

Xingjiang Zhou Tao Dong Nanlin Wang Hoyoung Jang Yingying Peng

This is my paper

classification cond-mat.supr-concond-mat.str-el PACS 74.72.-h78.47.J

keywords chargeordercupratesuperconductorsultrafastdynamicsresonantX-rayscatteringtime-resolvedabsorptionorbital-selectivephotodopingcharge-transfergapoverdopedBi2201

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper reports that in the overdoped cuprate (Bi,Pb)$_{2.12}$Sr$_{1.88}$CuO$_{6+\delta}$, only 400 nm (3.1 eV) light can melt the charge order, while 800 nm (1.55 eV) light cannot, even at higher absorbed photon densities. The authors argue that 400 nm photons carry enough energy to drive electrons from the Zhang-Rice singlet band into the upper Hubbard band or onto apical oxygen orbitals, transiently changing the doping level and suppressing the charge-order amplitude without altering its period or correlation length. The charge order recovers in about 3 ps, the same timescale seen in underdoped cuprates, which the authors take as evidence for a common electronic instability across the doping phase diagram. They also find that melting the overdoped charge order requires an order of magnitude higher fluence than in underdoped samples, pointing to a stronger role of lattice interactions at high doping.

What carries the argument

The argument is carried by combining time-resolved resonant X-ray scattering (tr-REXS) at the Cu $L_3$ edge with time-resolved X-ray absorption spectroscopy (tr-XAS), comparing the CO peak dynamics with the fluorescence (XAS) dynamics. The central mechanism is orbital-selective photodoping: 400 nm (3.1 eV) photons exceed the charge-transfer gap $\Delta_{\mathrm{CT}} \approx 2$ eV and transfer electrons from the Zhang-Rice singlet band (a hybrid Cu-O orbital band) to the upper Hubbard band or apical oxygen $2p_z$ states, transiently increasing planar hole doping; 800 nm (1.55 eV) photons lack this energy and only populate the Zhang-Rice band. The CO-specific recovery is extracted by fitting the pump-probe trace with two exponentials plus a thermal term whose timescale ($\sim$2 ps) is fixed from prior literature.

What would settle it

Measure the lattice temperature independently after 400 nm excitation—for example, via time-resolved X-ray thermal diffuse scattering or a phonon-sensitive probe—and check whether the thermal recovery actually has a ~2 ps timescale. If the thermal timescale is materially different, the two-exponential decomposition in Eq. (2) is not identifiable, and the 3 ps component cannot be assigned to charge-order reconstruction. A complementary check: scan the pump photon energy from 1.55 eV to 3.1 eV and verify that CO melting onsets at the ~2 eV charge-transfer gap; if melting appears below the gap, the orbital-selectivity interpretation fails.

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Extended reading notes

Core claim

The central finding is an excitation-energy-selective melting of charge order in overdoped Bi2201: 400 nm pump pulses suppress the resonant X-ray scattering peak at $Q_{\mathrm{CO}}$, while 800 nm pulses leave it unchanged after accounting for the transient X-ray absorption shift. The selectivity is traced to orbital character: 400 nm light crosses the ~2 eV charge-transfer gap and promotes electrons out of the Zhang-Rice singlet band (or out of the CuO$_2$ planes into apical oxygen states), effectively photodoping the planes, whereas 800 nm light only excites electrons within the O $2p$ manifold into the Zhang-Rice band and does not remove holes from the planes. The ~3 ps recovery of the CO peak after 400 nm excitation matches underdoped YBa$_2$Cu$_3$O$_{6.67}$ and striped nickelates, supporting a universal electronic origin for charge order, while the roughly tenfold higher fluence needed in the overdoped sample indicates that lattice coupling contributes to CO stability at high hole doping.

Load-bearing premise

The ~3 ps charge-order recovery time is extracted by assuming the pump-probe trace separates into a fast electronic recovery, a slow CO recovery, and a thermal background whose ~2 ps timescale is taken from earlier literature; if the thermal timescale is wrong or the two recovery processes overlap, the 3 ps value and the universality claim attached to it lose support.

Editorial extensions

If this is right

If the ~3 ps recovery is genuine, charge order in overdoped and underdoped cuprates share the same electronic recovery timescale, indicating a common origin for the ordered state across the phase diagram.
Orbital-selective photodoping can transiently change the in-plane doping level without disturbing the CO period or correlation length, offering a nonthermal control knob for the ordered phase.
The order-of-magnitude higher fluence required to melt overdoped CO implies that lattice degrees of freedom stabilize CO at high doping, so phonon-resonant or mid-infrared pumping should be able to disentangle electronic and lattice contributions.
Tuning pump photon energy to specific interband transitions of different orbital character can be used to selectively manipulate intertwined orders (charge, spin, nematicity) in other correlated materials such as nickelates, kagome metals, and iron-based superconductors.
Light-induced CO melting in the overdoped regime may transiently enhance superconductivity, in analogy to underdoped cuprates.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

If the 3 ps recovery really is doping-independent, the difference between underdoped and overdoped CO is not its electronic origin but the stiffness added by lattice coupling; a direct test would be to measure the CO recovery time after exciting a specific phonon mode.
The near-identical absorbed-photon densities for 800 nm and 400 nm (0.11 vs 0.14 photons/Cu at 5 mJ/cm$^2$) make a purely thermal or absorbed-energy explanation of the wavelength dependence implausible; this could be checked with a two-pulse experiment that first heats the lattice with 800 nm and then probes whether the CO melting threshold shifts.
The slow component that persists to 500 ps after 400 nm excitation suggests a long-lived out-of-plane charge transfer; if exploitable, this could be used to create metastable superconducting-like states, but the paper does not establish such an effect.
The robustness of overdoped CO to 0.1 mJ/cm$^2$, which easily melts underdoped CO, implies that any search for photo-enhanced superconductivity in overdoped cuprates should use pump energies above the charge-transfer gap, not the near-infrared wavelengths commonly used for underdoped samples.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

Colleague, this one is worth a serious look. The central observation—that 400 nm pump melts charge order in overdoped Bi2201 while 800 nm does not, even at higher absorbed photon density—is well supported and genuinely new. The normalization of scattering by fluorescence, the momentum check away from Q_CO, and the fluence series are the right controls. The XAS redshift and sub-ps recovery are consistent with prior work. That part is solid. What's less secure is the assignment of the ~3 ps slow recovery to CO reconstruction. Eq. (2) has two exponentials and a rising thermal term, with tau' fixed at ~2 ps from literature on other compounds. The plotted window is 0-8 ps, so a 3 ps decay and 2 ps rise are strongly overlapping. A2, A', and tau_r2 are not independently identified from this trace alone. The momentum dependence at Q=0.08 helps—the slow component disappears there—but the fit decomposition still carries the load. The 1% offset that persists to 500 ps (Supp. Fig. 7) could also absorb slow signal, though the authors mention it and assign it to out-of-plane transfer. So the universal-instability claim, which rests on the 3 ps value matching underdoped YBCO, is plausible but not established. The comparison itself is apples-to-oranges: different compound, different pump wavelength, different fluence. The orbital-selective photodoping mechanism is inferred, not directly probed. The O K-edge XAS and optical conductivity support the energy-level picture, and the citation to the orbitally selective photodoping paper is appropriate. But the mechanism remains an interpretation. That's fine for a letter; it's clearly labeled as such. The paper's own Discussion concedes that disentangling electronic and lattice contributions needs phonon-resonant experiments. I read that as honest, not as fatal. So: who's this for? Cuprate dynamics people and anyone working on light control of charge order. It deserves peer review. A good referee should push on Eq. (2), ask for fits with tau' free or with the electronic component fixed from the fluorescence channel, and check the sensitivity of tau_r2 to the long-time offset. If those hold, the wavelength dependence alone is a publishable result. I'd take it. Verdict: conditionally accept after the fit identifiability is addressed.

Referee Report

3 major / 3 minor

Summary. The manuscript reports time-resolved resonant X-ray scattering (tr-REXS) and time-resolved X-ray absorption spectroscopy (tr-XAS) on overdoped (Bi,Pb)2.12Sr1.88CuO6+δ (Tc≈11 K). The authors find that 800 nm excitation produces only a uniform, XAS-related suppression of the scattering and fluorescence signals, with no change in the charge-order (CO) peak after normalization, whereas 400 nm excitation melts the CO peak in a fluence-dependent manner. The CO recovery time is reported as ~3 ps, similar to underdoped cuprates, and the authors interpret this as evidence for a universal electronic instability across the cuprate phase diagram. They further propose that 400 nm light drives orbital-selective photodoping from the Zhang-Rice singlet band to the upper Hubbard band or apical oxygen states, transiently changing the in-plane doping, while 800 nm light lacks the energy to do so. The higher fluence required to melt overdoped CO is attributed to increased lattice coupling.

Significance. The central observation—the strong dependence of CO melting on pump photon energy—is well supported by the raw scattering and fluorescence data, the normalization procedure, and the momentum dependence at Q=0.08 r.l.u. If the 3 ps recovery time holds, the comparison to underdoped cuprates is an important step toward unifying the physics of charge order across the phase diagram. The paper also includes careful estimates of absorbed photon density per Cu site and a control away from Q_CO, which strengthen the assignment. However, the 3 ps value is extracted from a multi-exponential fit with a fixed thermal timescale, and the orbital-selective mechanism is inferred from static and transient XAS without direct spectral-weight quantification; both points need to be addressed before the universality claim is fully convincing.

major comments (3)

[CO dynamics dependence on pump laser wavelength and fluence (Eq. 2, Fig. 3c)] The decomposition in Eq. (2) that separates the slow recovery (tau_r2 ~ 3 ps) from the thermal term with tau' fixed at ~2 ps is not identifiable from the data shown. Over the displayed 0-8 ps window, the two exponentials have comparable time constants, and the orange thermal curve in Fig. 3c is a model output rather than an independent lattice-temperature measurement. Because tau' is taken from refs [39,40] rather than measured on this sample, A2, A', and tau_r2 can trade off; the ~1% offset persisting to 500 ps in Supplementary Fig. 7 could further absorb slowly varying signal. The authors should show that tau_r2 is stable when (i) tau' is left free, (ii) a baseline offset is included, or (iii) A' is constrained by a separate non-resonant probe. As written, the comparison to underdoped YBCO in Fig. 3d and the claim of a universal electronic instability rest on an unsecured decomposition.
[DISCUSSION (Fig. 4b)] The orbital-selective photodoping mechanism is inferred rather than directly evidenced. The transient O K-edge XAS in Fig. 4b shows changes in the ZRS peak, but the difference spectra are not quantified, and no resolved changes in the UHB or apical-oxygen states are presented. The conclusion that 400 nm depletes the ZRS band while 800 nm fills it is based on the relative amplitude of the ZRS suppression, and the assignment of the 400 nm transition to ZRS-to-UHB or ZRS-to-apical transfer relies on energetics and theory (ref 46). The authors should either provide quantitative spectral-weight analysis or explicitly label this mechanism as a hypothesis. This is central to the title's claim of 'orbital-selective photodoping.'
[CO dynamics dependence on pump laser wavelength and fluence (Fig. 2c, Fig. 3)] The CO recovery time is extracted from the intensity at a single momentum Q_CO, but the peak width and position are only reported at Δt=0.25 ps (Fig. 2c). If the CO peak broadens or shifts at later delays, the fixed-momentum intensity trace would not represent the CO order parameter alone. The authors should either measure time-resolved H scans at selected delays to confirm the lineshape remains constant throughout the recovery, or justify why a transient lineshape change cannot mimic the slow recovery component.

minor comments (3)

[Methods (sample characterization)] The word 'sourse' in the Methods section should be 'source'.
[Fig. 1c caption] The phrase 'scattering signals bare fitted with the Lorentzian function' should read 'scattering signals are fitted with the Lorentzian function'.
[Supplementary Note 1] The sentence 'The photoinduced shift of the UHB peak (~80.3±10.1 meV) are similar' should use the singular 'is similar'.

Circularity Check

0 steps flagged · score 0.0 of 10

No circular derivation: the experimental observations, independent external benchmarks, and the paper's own supporting spectroscopy carry the claims.

full rationale

The central claims — that 400 nm light melts overdoped CO while 800 nm light does not, that the CO recovery time is ~3 ps, and that unusually high fluence is required — are direct experimental observations fitted with stated functional forms. The ~3 ps recovery time is an output of Eq. (2), not an input used to define the comparison; it is benchmarked against independent tr-REXS measurements on underdoped YBCO and nickelates (refs 15, 16, 41). The fixed 2 ps lattice thermal timescale in Eq. (2) is imported from external literature (refs 39, 40), not from the authors' own prior work, so it does not create a self-referential loop. Self-citations (refs 25 and 26) supply equilibrium context — the existence and temperature robustness of overdoped CO — which is also directly measured in this work, so they are not load-bearing circular support. The orbital-selective photodoping interpretation is grounded in the paper's own O K-edge XAS and optical conductivity measurements plus an external theoretical calculation (ref 46). No step reduces by construction to its own inputs. The only substantive concern is the identifiability of the two recovery exponentials in Eq. (2) when tau' is fixed at 2 ps; that is a statistical and interpretive caveat, not a circularity, and the paper itself acknowledges the need for future phonon-resonant experiments to fully disentangle electronic and lattice contributions.

Assumptions & free parameters 4 free parameters · 5 assumptions · 0 invented entities

The central experimental result depends on the quality of the fluorescence normalization and the fit decomposition in Eq. (2). No new physical entities are introduced; the orbital-selective photodoping is a proposed mechanism rather than a new particle or field.

free parameters (4)

tau_r2 (slow recovery, assigned to CO reconstruction) = ~3 ps
Extracted from the 400 nm scattering dynamics fit, Eq. (2); this value is the key comparison to underdoped cuprates and supports the universal instability claim.
A1, A2, A' (fit amplitudes in Eq. 2)
Amplitudes of fast electronic, CO, and thermal components in the multi-exponential fit; not reported numerically in the text.
tau' (lattice thermal timescale) = ~2 ps
Fixed from prior literature (refs 39, 40) rather than measured in this sample; the 3 ps CO recovery time depends on this constraint.
tau_q (quench time) = ~0.1 ps
Resolution-limited quench time in Eqs. (1) and (2), used to model the initial fast intensity drop.

assumptions (5)

domain assumption The fluorescence-yield XAS signal accurately tracks the resonant absorption change and can be used to normalize the scattering signal.
The correction for the XAS redshift in Figs. 2a-b assumes fluorescence and scattering probe the same absorption change; if imperfect, the 800 nm null result could be an artifact.
domain assumption The charge-transfer gap in overdoped Bi2201 is about 2 eV, and 400 nm (3.1 eV) excites ZRS-to-UHB or apical-oxygen charge transfer, while 800 nm (1.55 eV) cannot.
Inferred from O K-edge XAS and optical conductivity (Fig. 4b-c); this is the basis of the orbital-selective photodoping mechanism.
ad hoc to paper The multi-exponential fit form in Eq. (2), with the thermal timescale tau' fixed, correctly separates electronic, CO, and thermal contributions.
The functional form is chosen to describe the data; the 3 ps CO recovery time is one output of this assumed decomposition.
domain assumption The observed XAS redshift of about 80 meV arises from ultrafast renormalization of the on-site Coulomb repulsion via dielectric screening, as in ref 27.
Used to interpret the transient XAS shift and the uniform scattering suppression under 800 nm excitation.
ad hoc to paper A recovery time of about 3 ps comparable to underdoped YBCO implies a universal electronic instability in the cuprate phase diagram.
Generalization from one overdoped sample and literature comparisons to a universal statement across the phase diagram.

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Pith. "Pith review of Ultrafast Orbital-Selective Photodoping Melts Charge Order in Overdoped Bi-based Cuprates." pith.science (2026). https://pith.science/paper/V3AQRWLG

@misc{pith2026250604697,
  author       = {Pith},
  title        = {Pith review of: Ultrafast Orbital-Selective Photodoping Melts Charge Order in Overdoped Bi-based Cuprates},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/V3AQRWLG}},
  note         = {Machine review of arXiv:2506.04697}
}

abstract

High-temperature superconductivity in cuprates remains one of the enduring puzzles of condensed matter physics, with charge order (CO) playing a central yet elusive role, particularly in the overdoped regime. Here, we employ time-resolved X-ray absorption spectroscopy and resonant X-ray scattering at a free-electron laser to probe the transient electronic density of states and ultrafast CO dynamics in overdoped (Bi,Pb)$_{2.12}$Sr$_{1.88}$CuO$_{6+\delta}$. We reveal a striking pump laser wavelength dependence - the 800 nm light fails to suppress CO, whereas the 400 nm light effectively melts it. This behavior originates from the fact that 400 nm photons can promote electrons from the Zhang-Rice singlet band to the upper Hubbard band or apical oxygen states, while 800 nm photons lack the energy to excite electrons across the charge-transfer gap. The CO recovery time ($\sim$3 ps) matches that of the underdoped cuprates, indicating universal electronic instability in the phase diagram. Additionally, melting overdoped CO requires an order-of-magnitude higher fluence highlighting the role of lattice interactions. Our findings demonstrate orbital-selective photodoping and provide a route to ultrafast control of emergent quantum phases in correlated materials.

Figures

Figures reproduced from arXiv: 2506.04697 by the authors.

**Figure 2.** d shows that the CO melting intensity increases with increasing fluence of 400 nm pump. On the other hand, the intensity change remains nearly zero under the 800 nm pump, even when the photons absorbed at each copper site are greater than those of the 400 nm pump [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗

**Figure 3.** FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

Figures from the paper (3 more)

**Figure 4.** Figure 4: a, the lower Hubbard band (LHB) and upper Hubbard band (UHB) arise from on-site Coulomb repulsion in the Cu 3d orbitals. Upon hole doping, the ZhangRice single (ZRS) band emerges because of hybridization between the hole on the planar Cu 3d orbital and the surroundi…

**Figure 2.** Figure 2: The widths are nearly unchanged, implying [PITH_FULL_IMAGE:figures/full_fig_p009_2.png]

**Figure 3.** Figure 3: The scattering intensity is uniformly suppressed [PITH_FULL_IMAGE:figures/full_fig_p009_3.png]

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